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How many different types of cells are found in the human body?
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human body
Vintage anatomy charts of the human body showing the skeletal and muscle systems.
The human body contains more than 200 different types of cells. While these cells are highly specialized to perform specific physiological functions, they are organized into four fundamental classes of tissues:12
- Epithelial tissues: These cover the body's surfaces and line internal organs, cavities, and passageways.2
- Muscle tissues: These are specialized for contraction, forming the body's musculature.2
- Nerve tissues: These conduct electrical impulses and constitute the nervous system.2
- Connective tissues: These consist of widely spaced cells within an intercellular matrix and serve to bind various body structures together.2
Although these cells are traditionally classified by their appearance under a microscope using histology, modern techniques—such as electron microscopy, immunohistochemistry, and in situ hybridization—have enabled researchers to identify an even greater variety of cell types, particularly within the brain and the immune system.1